DETROIT - A group of creditors in the Chapter 9 bankruptcy of the City of Detroit, which includes the union representing city employees and retirees, on Jan. 16 filed a brief objecting to the city's opposition to a motion filed by a group seeking to assess the art collection at the Detroit Institute of Arts to establish a benchmark valuation (In Re: City of Detroit, No. 13-53846, Chapter 9, E.D. Mich. Bkcy.).